package com.example.java_chatroom.api;

import com.example.java_chatroom.model.User;
import com.example.java_chatroom.model.UserMapper;
import jakarta.annotation.Resource;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpSession;
import org.springframework.dao.DuplicateKeyException;
import org.springframework.web.bind.annotation.*;

@RestController
public class UserAPI {
    @Resource
    UserMapper userMapper;

    @PostMapping("/login")
    @ResponseBody
    public Object login( String username,  String password, HttpServletRequest req){
        //1.先去数据库中查一下，看username能否找到对应的user对象
        //  如果能找到，则判断密码是否匹配
        User user = userMapper.selectByName(username);
        if(user == null || !user.getPassword().equals(password)){
            //这俩条件具备一个，登陆失败
            System.out.println("登陆失败！用户名或密码错误!" +  user);
            return new User();
        }

        //2.如果都匹配成功，则返回登录成功！创建会话！
        HttpSession session = req.getSession(true);
        session.setAttribute("user", user);
        //在返回之前把passed给干掉，避免返回不必要的信息。
        user.setPassword("");
        return user;
    }

    @PostMapping("/register")
    @ResponseBody
    public Object register( String username,  String password){
        User user = null;
        try{
            user = new User();
            user.setUserName(username);
            user.setPassword(password);
            int ret = userMapper.insert(user);
            System.out.println("注册ret：" + ret);
            user.setPassword("");
        } catch (DuplicateKeyException e){
            //如果insert方法抛出上述异常，则说明名字重复了，注册失败
            user= new User();
            System.out.println("注册失败！user = " + username);
        }
        return user;
    }

    @GetMapping("/getUserInfo")
    @ResponseBody
    public Object getUserInfo(HttpServletRequest req){
        //1.先从请求中获取到会话
        HttpSession session = req.getSession(false);
        if(session == null){
            //会话不存在，用户尚未登陆，此时返回一个空对象即可
            System.out.println("[getUserInfo]当前获取不到 session 对象！");
            return new User();
        }
        //2.从会话中和获取到之前保存的用户对象
        User user = (User) session.getAttribute("user");
        if(user == null){
            System.out.println("[getUserInfo]当前获取不到 user 对象！");
            return new User();
        }
        user.setPassword("");
        return user;

    }
}
